The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Niven Numbers in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 559th Steffan153 🇫🇮 946 35 38ms 11 days ago 562nd primo-ppcg 🇹🇭 946 44 123ms 25 Apr 2020 562nd prplz 🇦🇺 946 44 121ms 16 May 2020 562nd Lydxn 🇨🇦 946 44 125ms 12 Jan 2021 562nd JayXon 🇺🇸 946 44 124ms 16 Feb 2021 562nd sisyphus-ppcg 🇦🇺 946 44 123ms 30 May 2021 562nd ovs-code 🇩🇪 946 44 123ms 19 Nov 2021 562nd GrayJoKing 🇦🇺 946 44 122ms 15 Dec 2021 562nd MichalMarsalek 🇨🇿 946 44 128ms 16 Feb 2022 562nd lynn 946 44 124ms 3 Jun 2022 562nd MeWhenI 🇻🇦 946 44 125ms 10 Oct 2022 562nd clockworknazo 946 44 124ms 26 Nov 2022 562nd Steffan153 🇫🇮 946 44 125ms 30 Nov 2022 562nd sean-niemann 🇺🇸 946 44 125ms 17 Jan 2023 562nd DialFrost 🇸🇬 946 44 119ms 18 Jan 2023 562nd steffan-polygolf 946 44 127ms 19 Feb 2023 562nd Shanethegamer 🇺🇸 946 44 126ms 8 Mar 2023 562nd stefangimmillaro 946 44 123ms 11 Jun 2023 562nd Yewzir 🇧🇪 946 44 126ms 23 Sep 2023 562nd Betuaredead 946 44 120ms 13 Nov 2023 562nd pardouin 🇫🇷 946 44 120ms 21 Sep 2024 562nd fuzzylojik-golf 🇺🇸 946 44 122ms 7 Aug 2025 562nd dokutan 946 44 120ms 25 days ago 584th michael-pruglo 🇺🇦 946 50 1ms 13 Jul 2022 584th qwertyuiop3 🇷🇺 946 50 2ms 14 May 2025 586th JRaspass 🇬🇧 945 28 110ms 3 May 2018 586th labster 945 28 99ms 28 May 2018 586th phdphil 945 28 91ms 29 May 2018 586th AlexDaniel 🇪🇪 945 28 111ms 11 Oct 2018 586th metakuna 945 28 102ms 16 Apr 2019 586th retrohun 945 28 103ms 27 Apr 2019 586th SirBogman 🇺🇸 945 28 115ms 8 Feb 2020 586th jjatria 945 28 101ms 11 Jul 2020 586th Shanethegamer 🇺🇸 945 28 97ms 20 Mar 2021 586th lynn 945 28 106ms 13 Apr 2021 586th MeWhenI 🇻🇦 945 28 101ms 31 Jan 2023 586th DialFrost 🇸🇬 945 28 105ms 6 Feb 2023 586th SirFireball3521 945 28 104ms 8 Mar 2023 586th Yewzir 🇧🇪 945 28 108ms 17 Nov 2023 586th pardouin 🇫🇷 945 28 106ms 22 Aug 2024 586th fuzzylojik-golf 🇺🇸 945 28 85ms 21 Aug 2025 602nd primo-ppcg 🇹🇭 945 45 77ms 12 Oct 2020 602nd prplz 🇦🇺 945 45 81ms 13 Oct 2020 602nd Lydxn 🇨🇦 945 45 79ms 12 Jan 2021 602nd JayXon 🇺🇸 945 45 77ms 11 Feb 2021 602nd sisyphus-ppcg 🇦🇺 945 45 78ms 30 May 2021 602nd cure-honey 🇯🇵 945 45 79ms 29 Jun 2021 602nd ovs-code 🇩🇪 945 45 84ms 19 Nov 2021 602nd GrayJoKing 🇦🇺 945 45 79ms 14 Mar 2022 602nd lynn 945 45 80ms 3 Jun 2022 602nd stefangimmillaro 945 45 79ms 30 Sep 2022 602nd MeWhenI 🇻🇦 945 45 85ms 10 Oct 2022 602nd clockworknazo 945 45 81ms 13 Oct 2022 602nd Steffan153 🇫🇮 945 45 76ms 24 Nov 2022 602nd sean-niemann 🇺🇸 945 45 79ms 17 Jan 2023 602nd DialFrost 🇸🇬 945 45 80ms 6 Feb 2023 602nd steffan-polygolf 945 45 75ms 19 Feb 2023 602nd Shanethegamer 🇺🇸 945 45 79ms 8 Mar 2023 602nd Yewzir 🇧🇪 945 45 73ms 13 Oct 2023 602nd Betuaredead 945 45 81ms 11 Nov 2023 602nd pardouin 🇫🇷 945 45 81ms 22 Aug 2024 602nd fuzzylojik-golf 🇺🇸 945 45 79ms 12 Jul 2025 602nd edsrzf 🇳🇿 945 45 81ms 26 Jul 2025 602nd albanian-laundromat 945 45 81ms 24 Sep 2025 602nd snoozingnewt 🇨🇦 945 45 80ms 4 Dec 2025 602nd dokutan 945 45 84ms 25 days ago 627th Lydxn 🇨🇦 945 68 56ms 1 Jan 2022 627th prplz 🇦🇺 945 68 58ms 1 Jan 2022 627th JayXon 🇺🇸 945 68 56ms 5 Jan 2022 627th sisyphus-ppcg 🇦🇺 945 68 52ms 23 Mar 2022 627th nwellnhof 🇩🇪 945 68 51ms 8 Aug 2022 627th Steffan153 🇫🇮 945 68 58ms 17 Nov 2022 627th inventshah 945 68 57ms 26 Jan 2023 627th sean-niemann 🇺🇸 945 68 59ms 11 Apr 2023 627th Alex-x90 🇺🇸 945 68 55ms 17 Jul 2023 627th xsot 🇸🇬 945 68 58ms 22 May 2024 627th KasperKivimaeki 🇫🇮 945 68 58ms 15 Feb 2025 627th pardouin 🇫🇷 945 68 58ms 31 May 2025 627th fuzzylojik-golf 🇺🇸 945 68 59ms 14 Jul 2025 627th 09cf 945 68 57ms 26 Nov 2025 First Prev 561–640 of 4,246 Next Last